180 degrees
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That's a difference of 120 degrees.
c=90 degrees s=180 degrees
The sum of the internal angles of a polygon of n sides is (n-2)*180 degrees.
The sum of the interior angles of an n-sided polygon (I presume that's what you mean), in degrees, is 180 * (n - 2). Here, n is 9 so the answer is 7 * 180 which is 1,260 degrees.
S=180n-360